How do I sign the signature block for a decease spouse? In you signature, John Doe filing as decease spouse, then in spouse signature block sign Jane Doe?

[Bsch4477]

You should sign the return and write "filing as surviving spouse" in the signature area below your signature.

[kevino1]

Thanks do I leave the spouse signature block blank then?

[Bsch4477]

Yes. If the software didn’t enter this, write “Deceased” and spouse’s name and date of death at the top of the 1040.  A complete answer from the IRS is here:

https://www.irs.gov/faqs/irs-procedures/signing-the-return/signing-the-return